Supercharger



Julie 25, 1940. c, WASEIGE 2,205,549

SUPERCHARGER Original Filed March 18, 1936 IN VEN TOR: CHER u'as Rnwmovwo WHSEIGE HTTORN I Patented June 25, 1940- PATENT OFF-ICE 2,205,549 sursnonanann Charles Raymond Waseige, Bueil, France Original application March 18, 1936, Serial No.

69,497. Divided and this application May 19, 1938, Serial No. 208,752.- Renewed Februa y 26, i940; In Japan August'l, 1935 a comin "(01. sac-n4) My invention relates to aircraft power plants including at least one engine provided with its own rotary supercharger. One object of my invention is to devise air feeding means to each 5 supercharger so as to increase the efliciency ratio of the supercharger. Another object istosupply a flow of air into the central region of the rotary impeller with a minimum loss of pressure. A furtherobject isto cause the air stream on its way to the impeller to rotate at a high speed and substantially co'axially with and in the same direction as the toenter the latter.

With these andother objects in view ,my in- 5 vention resides in the novel arrangement of parts hereinafter described and more fully pointed out in the claims. i

This application is a division of my copending application #69397 filed March 18, 1936, now

' Patent #2,120,821"-'of June-14, 1938. v

' An embodiment of my invention is-diagrammatically illustrated in longitudinal section in the annexed drawing.'

i denotes the crankcase of an engine the front face of which carries the casing of a centrifugal supercharger or compressor! having its ,dis-

charge side connected to the engine cylinders 3 by delivery pipes 4. The compressor is enclosed within a stream lined shell 5 coaxial with the compressor and having a central orifice 6 con-- nected to the centralintake l in the supercharging'casing bya rectilinear duct 8. Inside said; duct is stationarily fitted a screw deflector. Q the pitch of which gradually decreases from the inlet oriflcet to its end centrally projecting .into the compressorcasing. The duct 8 flares somewhat outwardly from the. intake 1 of the compressor to the inlet orifice-i and the .shell 5 extends from the engine 'crankcaseedge'to the foremost end 01 the duct 8. s n

-It will be readily lmderstogrgd, that'when streamof air isflowlng duct I to impeller when aboutv the supercharger 2 it has progressively imparted thereto a rotary motion by the screw deflector 9 and will rotate at high speed about the supercharger axis when about to enter the impeller. 'Ifhe pitch-oi the deflector 9 and the direction 5 o; rotation of the impeller are chosen in order that the air will rotate in the same direction as the impeller.

' In this arrangement the loss of pressure is reduced to a minimum owing to therectilinear formation of the duct 8.'

What I claim-is:

1. A supercharger for engines, comprisinga centrifugal-compressor having a centrally dis- .posedrectilinear. air duct of truncated form ex- 1 tending laterally therefrom, said air duct being -longitudinally tapered toward the compressor,

and a stationary helical deflector disposed within saiggair duct, the pitch of "said deflector decre ing progressively toward thecompressor.

2; A supercharger, for engines, comprising a.

centrifugal compressor having a centrally dis-' posed rectilinear air duct of truncated form extending laterally therefrom, said air duct being longitudinally tapered-toward the compressor, a 25 stationary helical deflector disposed within said air duct, the pitch of said deflector decreasing progressively toward the. compressor, and a stream-lined shell forming an air-tight enclo-,

sure for-said compressor and air duct and hav- 30 ing a. centrally disposed opening in register with the intake endflof said duct.

3. A supercharger for engines, comprising a centrifugal compressor having a centrally disposed rectilinear air duct of truncated form ex- 35 tendinglaterallytherefrom, said air duct being longitudinally tapered toward the compressor, and a'flxed, truncated screw. disposed within said air duct, the pitch of-said screw decreasing progressively towards the compressor.

'J mm) wasmas. 

